144 
H - Jn 14 - 2 
/N 
I METER 
H- Jnl4-3 
✓ N 
Psyche 
NEST 7 
[Vol. 88 
NEST 
MOVEMENT DATE 
1- 2 6/15 
2- 3 7/2 
3- 1 7/7 
1-4 7/9 
4- 3 7/15 
3- 4 7/18 
4- 5 7/22 
5- 1 7/27 
1- 4 7/30 
4- 6 7/31 
6- 5 8/3 
5- 4 8/5 
4-6 8/6 
6 - 2 8/11 
2- 1 8/13 
1-4 8/15 
4-6 8/17 
NEST 
MOVEMENT DATE 
1-2 6/18 
2- 3 6/22 
3- 4 7/10 
4- 5 7/20 
5- 1 7/27 
' 1-6 8/1 
6- 7 8/11 
7 4 8/14 
I METER 
H - Jn 18-1 
/ N 
i 1 
I METER 
NEST 4 
NEST 6 
NEST 2*^ 
NEST I 
NEST 
MOVEMENT DATE 
1- 2 7/1 
2- 3 7/5 
3- 4 7/11 
4- 2 7/17 
2- 3 7/21 
3- 5 7/29 
5- 2 8/4 
2- 1 8/5 
1-3 8/8 
3- 6 8/13 
Figure 6. Patterns of emigrations for three colonies of Pheidole hyatti. Dates of 
nest movements are shown on the right. *This nest had two entrances. 
are short-lived. When these nests are disturbed, the colonies quickly 
organize emigrations to other such nests (Holldobler and Wilson 
1977). Leptothorax acervorum in oak-juniper woodland, construct 
delicate nests under stones which can be easily dislodged by large 
vertebrates, and are prone to emigrate when their nest is disturbed 
(Moglich 1979). 
Most species build or choose nest sites which are longer-lived and 
less easily disturbed and are thought to emigrate infrequently. 
Among these species emigrations can be due to a local factor such as 
